Strain-insulator.



- 1N0. 882,979. v PATENTED MA'R.24, 1908.

W. G. TERRY. STRAIN INSULATOR.

APPLICATION FILED FBB.14. 1907.

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WILLIAM o. TERRY, or BOSTON, MASSACHUSETTS, ASSIGNOR, BY Mnsss ASSIGNMENTS, 'ro THE MACALLEN COMPANY, or Bos'roN; MASSACHUSETTS, A CORPORATION or Maser;-

onussrrs.

To all whom it may concern:

Be it known that LfWILLLAM (l. TERRY, a

citizen of the United States, residing at Boston, county of Suffolk, State of Massachusetts, have invented a. certain new and useful Improvement in Strain-Insulators, of

i which the following is a specification, refer- 'fio insulators, but is especially adapted for use with what are 'known'as wooden straininsulators which consist of a piece or bar of wood, to each end of which is fastened a metallic cap for attachment to the wire. The invention will be fully understood from the following description taken in connection with, the accompanying drawings,

; and the novel features thereof are pointed out and clearly defined in the claims at the close of the specification.

"Referring to the draWings,+-Figure 1 is a ,side elevation of a strain insulator embody ingj my invention, showing .the wires at tached thereto. Fig. 2 is atop plan view of the left hand end of the strain insulator and wire shown in' Fig. 1. Fig. 8 is a bottom plan view of the same portion of'the insulator. Fig. 4 is a side elevation of the left. hand end of.Fig. 1, partly in section for convenience of illustration.

Referring now, to the drawings-at A is shown the body of the insulator, which may side Walls 11 and 12,. substantially be wood or similar suitable insulating material. At B, B, are indicated the caps which are secured to the Wooden body in any convenient or well known. manner. On each of v the caps B, B, is constructed the device which will now be described, by means of which the wire Qmay be readilyattached or as may be required, from the This structure may be cast or may Apairf of arallel be built up, as may be desire r with each othn project from the en ofthe cap B; These side walls are somewhat (trapezoidal in shape, as shown by the elevae tionin Fig. l, and are connectedfibyj a round Specification of Letters Patent. Applieatidn filed. February 14 1907. Serial so. 357,269.

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'cross piece 13 at theirextremity and two other cross pieces or webs 14 and 15 (see Fig. 4), the lower one 15 of whioh is substantially a half round. These three cross-pieces may be of any desired shape in cross-section, but .I consider it preferable to have the portions over which. the wire is 'to pass rounded as 'shownin. the drawings. A transverse 0 ening 16 through the two side walls 11' am 12 isprovided. 4

Theinterior faces of the two side walls 11 and 12 convergeslightly toward each other toward the. extreme point'of the insulator,

that is, toward the lett, as seen in Figs. 2 and 3." This convergenceis most noticeable in the. top plan view in Fig. 2, but also may be B or in any this I other convenient place may e located one or more lugs which may bebent about the wire and which assist to maintain it in place. In the drawings,,l have shown two lugs 17 and 18 on the end face, of the cap B.

The wire is attaihed to the insulator in the following manner. 3 The end of the wire is first. inserted between the cross pieces 13 and the halfround web or, cross lacs 15, as shownin dotted line in Fig. at. I u shaped bend is then made in the lower end of the wire, and the end of the U is pushed up between the two webs 14 and 15 and the body of the cap B thus passing between two In s 17 and '18. These lugs are then hammere over against the wire, as shown in Figs. 2 and 3, and the main end of the wire 0 is straight cried out into its normal position, beingthus wedg'ed between the two converging faces of the side walls 11 and 12. to hold the end'of the wire 0 in tion. The strain to pull the wire between the converging side walls 11 and 12, and tends to seat, the wire against the round cross proper posiwire will be wedged-in place. By this means, the end'of the wireis securely attached to the insulator, but may be readily removed, it onlybeing necessary to lift up the "wire to the pesition shownin. dotted lines in Fig. 4, when the U-shaped loop may easily be forced I out of connectionwithjthe lugeli and 18.

or pine-hed- (placed upon the wire tends piece 18. There pull, the more firmly the The two lugs serve Wbilo l nn-v described. my invontiim as 4 applied to a wooden strain insulator, it is obvious tlzai it may bo applied with equal mum-5s to iusulaiors of other forum.

lv Tho improu-ll insulator provided with an vnd rap having then-on a pair of side wallsmConYl-rging toward oauli other and i'o.-= plows bviwr-ou tliv mid. xido walk. l)(" tween and about which the wiro pa so wlivrcby flu strain placvd upon tluwin roudfi to pinch tho nirv bvtweon tin. i-ouvvrgiug far-( :4 of tlio said Hill i'alls.

2. Tin improrml insulator providvd with an (-ud (-ap baring tin-r0011 two side Walls, Y on i:i(( bolus-on the said side walls, boand about which the wire t0 [)0 at l ia'vl'wd to the in$nlator passes. and a lug to be bent about tho and W111.

'llio improved insulator provided with an and cap baving'iwo side walls whose adjIXUPHb iztucs oom'ergv in two planes toward eacb'ol-lior, and cross plucvs between the said side walls. between and about which the wire to iii a ttaclwd to tho insulator passes, whoreb i tuv strain plau-ed upon tho wire tends to pinqii the wirv between ill(-- ooin'vrging farms ol' the said sido walls.

ln teb'tiinony wlnu'ool l allix my signature. in presence of two \\it/H(}SH(R.

WllililAM TERRY. Witnessos:

(lraonun Pi [)IKE, Alana ll. Kim-nusox. 

